White Balance Adjustment - Panasonic TH-42PX6U Service Manual

TH-42PX600U
12 Adjustment

12.1. White balance adjustment

Instrument Name
· W/B pattern
· Color analyzer
(Minolta CA-100 or equivalent)
· Ensure aging is adequate.
· Make sure the front panel to be used on the final set is fitted.
· Make sure a color signal is not being shown before adjustment.
· Put the color analyzer where there is little color variation.
1. Output a white balance pattern.
2. Check that the color temperature is "cool".
3. Set to factory mode, WB-ADJ.
4. Set "R-CUT" "G-CUT" "B-CUT" 80h.
5. Attach the sensor of color analyzer to the center of highlight window.
6. Fix G drive at C0h and adjust "B-DRV" and "R-DRV" so x, y value of color analyzer
become the "Color temperature High" in table 1.
7. Increase RGB together so the maximum drive value in RGB becomes FCh. That is, set
"ALL DRIVE" to FCh.
8. Set color temperature to "Normal".
9. Set "R-CUT" "G-CUT" "B-CUT" 80h.
10. Attach the sensor of color analyzer to the center of highlight window.
11. Fix G drive at C0h and adjust "B-DRV" and "R-DRV" so x, y value of color analyzer
become the "Color temperature Mid" in table 1.
12. Increase RGB together so the maximum drive value in RGB becomes FCh. That is, set
"ALL DRIVE" to FCh.
* When WB-ADJ(mid) is adjusted by data-offset, set values as follows.
R-DRV : the same as R-DRV_cool
G-DRV : "G-DRV_cool" -2hDAC
B-DRV : "B-DRV_cool" -22hDAC
13. Set color temperature to "Warm".
14. Set "R-CUT" "G-CUT" "B-CUT" 80h.
15. Attach the sensor of color analyzer to the center of highlight window.
16. Fix G drive at C0h and adjust "B-DRV" and "R-DRV so x, y value of color analyzer
become the "Color temperature Low" in table 1.
17. Increase RGB together so the maximum drive value in RGB becomes FCh. That is, set
"ALL DRIVE" to FCh.
* When WB-ADJ(warm) is adjusted by data-offset, set values as follows.
R-DRV : the same as R-DRV_cool
G-DRV : "G-DRV_cool" -AhDAC
B-DRV : "B-DRV_cool" -62hDAC
18. Set color temperature to "Cool".
19. Copy values adjusted by HD pattern to the NTSC data area of EEPROM.
Connection
Component input
Panel surface
Procedure
40
Remarks
User setting: Normal
Remarks
Pic Menu: Vivid
Picture: +30
ASPECT: FULL
· Highlight section
Signal amplitude 75%